I just purchased a TQNS4B and have yet been able to successfully watch anything OTA.
I receive an error stating weak signal, but when I look at the channels they are all strong. My antenna is good as I can connect directly to my TV and watch whatever I want without any difficulties.
I have power cleared, reset, rescanned the device numerous times to no avail.
Do you have a hard drive connected to your Tablo QUAD?
Remove any splitters between the antenna to Tablo. Ideally you want one single physical direct cable run from the antenna to Tablo. No combiners, no joiners, no splitters.
If you’re using internal storage, it’s worth checking to see if the drive is seated properly. There should be a tiny bit of foam in the drive bay that ensures the drive stays in the right spot.
The support team is still in the office for a little while longer. They’d be happy to give you a hand as well: www.tablotv.com/ask-tablo/
This is likely your problem. Your TVs do not have an internal splitter in them, the Tablo does, it is how it feeds the 4 tuners. The 1x4 internal splitter does result in some signal loss. Get a better OTA antenna, likely a larger outdoor one will solve your problem.